java - What are the conditions for Serializable? -

suppose have java class, myclass, not inherited class. myclass implements serializable.

can myclass serializable no other conditions? depend on objects myclass contain, , if these objects serializable themselves?

for example in class below, if mappedoodle2 not implement serializable, exception when mappedoodle serialized?

import java.io.serializable;  public class mappedoodle implements serializable {    private static final long serialversionuid = -1760231235147491826l;    private string text;    private int value;    private mappedoodle2 mm = new mappedoodle2();     public mappedoodle(string text, int value) {                   this.text = text;        this.value = value;    }     public string gettext() {        return text;    }     public int getvalue() {        return value;    }     @override    public string tostring() {        return text + ", " + value;    }  } 

to serialize object, i'm assuming using objectoutputstream. here's relevant documentation: http://docs.oracle.com/javase/7/docs/api/java/io/objectoutputstream.html#writeobject(java.lang.object)

that section describes basics of how objects written. stream writes following:

• the class object is
• the signature (public class mappedoodle implements serializable)
• all fields neither transient nor static

each field object written stream. means each field must implement serializable. if doesn't, notserializableexception.

you have couple of options making work:

• make mappedoodle2 serializable
• make field mm transient, means won't serialized.